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Originally Posted by inpariswithyou
No firewall, unless there's a secret one on my computer I don't know about. This worked before, though I can't remember if that was before or after I upgraded to Windows 10... and never on my iPad Pro, only on my old iPad Air.
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Well, Windows does have a not-so-secret one that seems to want to enable itself and block all useful traffic. And it is likely that upgrading to Windows 10 would reset some of the settings, so you might want to check.
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2.4 and 5.0 are speeds, yes, but they're set up as distinct networks to separate out the devices that may use them. At least that's what Comcast said. I know some devices can't see the 5.0, for instance, but can see the 2.4. In any case, there's also the distinct network set up by the Apple Airport.
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Whether devices can see the 2.4GHz or 5GHz networks depends on the WiFi hardware. At the moment, I think anything that can see 5GHz will see both, but there are plenty of devices that are 2.4GHz only. The different parts "meet" in the router, but it can be set to isolate the different parts of the network. I have had several WiFi routers with options so that the WiFi devices couldn't see the wired devices or each other.
Do you have another PC that you can use to connect to the desktop running calibre? Can you ping or otherwise detect the iPad from the desktop?